# i=1
# while i<10:
#     i+=1
#     if i%2>0:
#      continue
#     print(i)

i=1
while 1:
    print(i)
    i=i+1
    if i>10:#当i大于10跳出循环
        break


c=0
while c<5:
    print(c,'is less than 5')
    c +=1
else:
    print(c,'is not less than 5')

for num in range(10,20):
    for i in range(2,num):
        if num % i== 0:
            j=num/i
            print('%d 等于 %d * %d'%(num,i,j))
            break
    else:
        print(num,'是一个质数')